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Whole genome analyses for c-type cytochromes associated with respiratory chains in the extreme thermophile, Thermus thermophilus.
Journal of General and Applied Microbiology 2023 June 31
In thermophilic microorganisms, c-type cytochrome (cyt) proteins mainly function in the respiratory chain as electron carriers. Genome analyses at the beginning of this century revealed a variety of genes harboring the heme c motif. Here, we describe the results of surveying genes with the heme c motif, CxxCH, in a genome database comprising four strains of Thermus thermophilus, including strain HB8, and the confirmation of 19 c-type cytochromes among 27 selected genes. We analyzed the 19 genes, including the expression of four, by a bioinformatics approach to elucidate their individual attributes. One of the approaches included an analysis based on the secondary structure alignment pattern between the heme c motif and the 6th ligand. The predicted structures revealed many cyt c domains with fewer β-strands, such as mitochondrial cyt c, in addition to the β-strand unique to Thermus inserted in cyt c domains, as in T. thermophilus cyt c552 and caa3 cyt c oxidase subunit IIc. The surveyed thermophiles harbor potential proteins with a variety of cyt c folds. The gene analyses led to the development of an index for the classification of cyt c domains. Based on these results, we propose names for T. thermophilus genes harboring the cyt c fold.
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